/**
 * Copyright (C) 2010 Nicolas Vahlas <nico@vahlas.eu>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.sung.json.scheam.impl.validators;

import com.sung.json.scheam.impl.JSONValidator;
import org.codehaus.jackson.JsonNode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

/**
 * Implements "enum" validation on all types of objects as defined in
 * the paragraph 5.17 of the JSON Schema specification.<br/>
 * <br/>
 * This implementation relies on the <code>equals</code> method implemented
 * on the <code>JsonNode</code> object.
 */
public class EnumValidator implements JSONValidator, Serializable {

    private static final long serialVersionUID = -7163667264068815707L;
    private static final Logger LOG = LoggerFactory.getLogger(EnumValidator.class);

    public static final String PROPERTY = "enum";

    protected List<JsonNode> nodes;
    protected String error;

    public EnumValidator(JsonNode enumNode) {
        nodes = new ArrayList<JsonNode>();
        error = "[none]";

        if (enumNode != null && enumNode.isArray()) {
            error = "[";
            int i = 0;
            for (JsonNode n : enumNode) {
                nodes.add(n);

                String v = n.getValueAsText();
                error = error + (i == 0 ? "" : ", ") + v;
                i++;

            }
            error = error + "]";
        }
    }

    @Override
    public List<String> validate(JsonNode node, String at) {
        LOG.debug("validate( " + node + ", " + at + ")");
        return validate(node, null, at);
    }

    @Override
    public List<String> validate(JsonNode node, JsonNode parent, String at) {
        LOG.debug("validate( " + node + ", " + parent + ", " + at + ")");
        List<String> errors = new ArrayList<String>();

        if (!nodes.contains(node)) {
            errors.add(at + ": 没有符合正确的枚举值选择: " + error);
        }

        return errors;
    }

}
